BAEL-8841 Merge vaadin and vaadin-spring

- Moved vaadin-spring code to vaadin module

vaadin/src/main/java/com/baeldung/Application.java

@@ -0,0 +1,29 @@
+package com.baeldung;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class Application {
+
+    private static final Logger log = LoggerFactory.getLogger(Application.class);
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class);
+    }
+
+    @Bean
+    public CommandLineRunner loadData(EmployeeRepository repository) {
+        return (args) -> {
+            repository.save(new Employee("Bill", "Gates"));
+            repository.save(new Employee("Mark", "Zuckerberg"));
+            repository.save(new Employee("Sundar", "Pichai"));
+            repository.save(new Employee("Jeff", "Bezos"));
+        };
+    }
+}